Figs. 316-325. — Heart and arterial cone of fishes, 316, Heart of shark; 317, Heart 
of catfish, Si/urus glanis ; 318, Heart of shark, shown opened at the side. 319. Conus 
arteriosus (inner view) of Chimera. 320. Conus of Ceratodus. 321. Conus of Protopte- 
rus. 322. Conus of Lepidosteus. 323. Conus of Amia. 324. Conus and bulbus of the 
Teleost, Autrinus. 325. Conus and bulbus of the Teleost, Clupea. (Figs. 316-318 
after WIEDERSHEIM, 320-325 after BOAS.) 
A. Aorta, AU, Auricle. &. Bulbus. C. Conus. V. Valves. VEN. Ventricle. 
258 
